e-comp-wl: Create compositor screenshooter global and add function to actually handle taking shots
e-comp-wl: Create compositor screenshooter global and add function to actually handle taking shots

Signed-off-by: Chris Michael <177aeddb9e34930a357ecd8dd2d21c80fe280c85@samsung.com>

tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment